documentation: fix CMSIS doxygen for SAM3x8e

cpu/sam3x8e/include/component/component_adc.h

cpu/sam3x8e/include/component/component_can.h

cpu/sam3x8e/include/component/component_chipid.h

cpu/sam3x8e/include/component/component_dacc.h

cpu/sam3x8e/include/component/component_dmac.h

cpu/sam3x8e/include/component/component_efc.h

cpu/sam3x8e/include/component/component_emac.h

cpu/sam3x8e/include/component/component_gpbr.h

cpu/sam3x8e/include/component/component_hsmci.h

cpu/sam3x8e/include/component/component_matrix.h

cpu/sam3x8e/include/component/component_pdc.h

cpu/sam3x8e/include/component/component_pio.h

cpu/sam3x8e/include/component/component_pmc.h

cpu/sam3x8e/include/component/component_pwm.h

cpu/sam3x8e/include/component/component_rstc.h

cpu/sam3x8e/include/component/component_rtc.h

cpu/sam3x8e/include/component/component_rtt.h

cpu/sam3x8e/include/component/component_sdramc.h

cpu/sam3x8e/include/component/component_smc.h

cpu/sam3x8e/include/component/component_spi.h